Aftermarket signals to function as OEM

So i have these cool aftermarket turn signals i want to put on my 650B2. but they are single filament. I believe the OEM ones were dual. Would it be possible to have these work as both a running light and a signal? Instead of a dim running light and a bright signal light ( stock) could it just be a running light that turns on and off when used as a signal?

You could do it, but it would require some fancy relay wiring ($) to turn off the running light when the blinker is activated. A lot easier to just purchase 2 element lights just like stock.

DoctoRot wrote: Would it be possible to have these work as both a running light and a signal? Instead of a dim running light and a bright signal light ( stock) could it just be a running light that turns on and off when used as a signal?

To do the dim/bright stock combination with the single filament you would need two diodes and a fairly good sized resistor, one that could handle like 20W. It would get very hot, and you'd have to make sure it was mounted where it couldn't melt anything.

The on/off blink could be done with a relay. This has the benefit of nothing getting hot. If you used the normally-closed contact of a double-throw relay, you could have the running light circuit pass through the relay under normal conditions. The turn signal wire would drive the relay coil, and cause the relay to open and blink off the filament. I think that would be pretty easy. Hmm... I guess you'd need a relay for each side.

Here is a good example of a SPDT (single pole double throw) relay with screw terminals that would be easy to install...
www.elkproducts.com elk-912

These folks have it for $8.80.

You could do it without much power loss using a power P-FET in the positive line driving the bulb on (with a pull down resistor between the gate and ground) and the drain driving the filament of the bulb. Use the "high-low" signal off the turn signal flasher line through a resistor to pull the gate of the P-FET up/down to make the front lights blink. You would not need a relay.

thanks for the in depth repiles. Both of those seem rather difficult given my level of expertise with electrical stuff. I found some 2 contact sockets that I am going to adapt to fit. If that fails i will give one of these a try.

If swapping out the bulb sockets does not work out, I can draw you a diagram for wiring the relays. It would be pretty simple to do.

You could certainly use a transistor circuit as well, but I would argue that the relay would be easier to understand and wire up (especially the one I mentioned with screw terminals) and work just as well.

thanks ill keeep that in mind

after scouring the internet i was able to find the exact same dimension socket with dual contact. also found a 8w23w bulb to fit. I broke the flange on the single socket off and epoxied it onto the new dual socket. installed the signals and is good to go.

You might want to spot solder the flange to the new holder since that's what the bulb ground current runs through. An epoxy connect might get flaky after vibrating a while.

Its not like the stock indicator lights where it runs through the whole stem to the headlight bucket. The ground actually only runs through the socket. You can see in the first pic of the sockets the ground wire is poking out.

Oh, so it doesn't ground through the metal shell.